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Stephen Minakian
2025-07-17 17:47:13 -06:00
commit b1ba6821e1
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#include <string.h>
#include <stdlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "nvs.h"
#include "wifi_manager.h"
static const char *TAG = "WIFI_MANAGER";
// FreeRTOS event group for WiFi events
static EventGroupHandle_t s_wifi_event_group;
// Current WiFi state
static wifi_state_t s_wifi_state = WIFI_STATE_DISCONNECTED;
// Retry counter
static int s_retry_num = 0;
// Event callback
static wifi_event_callback_t s_event_callback = NULL;
// Scan mode flag
static bool s_scan_mode = false;
// NVS namespace
#define NVS_NAMESPACE "wifi_creds"
static void wifi_event_handler(void* arg, esp_event_base_t event_base,
int32_t event_id, void* event_data)
{
if (event_base == WIFI_EVENT) {
switch (event_id) {
case WIFI_EVENT_STA_START:
if (!s_scan_mode) { // Only connect if not in scan mode
esp_wifi_connect();
s_wifi_state = WIFI_STATE_CONNECTING;
if (s_event_callback) {
s_event_callback(s_wifi_state);
}
}
break;
case WIFI_EVENT_STA_DISCONNECTED:
if (event_data) {
wifi_event_sta_disconnected_t* disconnected = (wifi_event_sta_disconnected_t*) event_data;
ESP_LOGE(TAG, "Disconnect reason : %d", disconnected->reason);
switch(disconnected->reason) {
case WIFI_REASON_AUTH_EXPIRE:
ESP_LOGE(TAG, "Authentication expired");
break;
case WIFI_REASON_AUTH_FAIL:
ESP_LOGE(TAG, "Authentication failed");
break;
case WIFI_REASON_NO_AP_FOUND:
ESP_LOGE(TAG, "AP not found - check SSID");
break;
case WIFI_REASON_HANDSHAKE_TIMEOUT:
ESP_LOGE(TAG, "Handshake timeout - check password");
break;
default:
ESP_LOGE(TAG, "Other reason: %d", disconnected->reason);
}
}
if (s_retry_num < WIFI_MAXIMUM_RETRY) {
esp_wifi_connect();
s_retry_num++;
ESP_LOGI(TAG, "Retry connecting to AP (%d/%d)", s_retry_num, WIFI_MAXIMUM_RETRY);
} else {
xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
s_wifi_state = WIFI_STATE_ERROR;
ESP_LOGI(TAG, "Failed to connect to AP");
}
if (s_event_callback) {
s_event_callback(s_wifi_state);
}
break;
default:
break;
}
} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
ESP_LOGI(TAG, "Got IP: " IPSTR, IP2STR(&event->ip_info.ip));
s_retry_num = 0;
xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
s_wifi_state = WIFI_STATE_CONNECTED;
if (s_event_callback) {
s_event_callback(s_wifi_state);
}
}
}
esp_err_t wifi_manager_init(void)
{
esp_err_t ret = ESP_OK;
// Initialize NVS
ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK(ret);
// Create event group
s_wifi_event_group = xEventGroupCreate();
if (s_wifi_event_group == NULL) {
ESP_LOGE(TAG, "Failed to create event group");
return ESP_FAIL;
}
// Initialize TCP/IP stack
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
esp_netif_create_default_wifi_sta();
// Initialize WiFi with default config
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
// Register event handlers
ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
ESP_EVENT_ANY_ID,
&wifi_event_handler,
NULL,
NULL));
ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
IP_EVENT_STA_GOT_IP,
&wifi_event_handler,
NULL,
NULL));
// Set WiFi mode to station
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
// Disable power save mode to ensure WiFi works properly
ESP_ERROR_CHECK(esp_wifi_set_ps(WIFI_PS_NONE));
// Set WiFi country (important for proper channel scanning)
wifi_country_t wifi_country = {
.cc = "US",
.schan = 1,
.nchan = 11,
.max_tx_power = 84,
.policy = WIFI_COUNTRY_POLICY_AUTO,
};
ESP_ERROR_CHECK(esp_wifi_set_country(&wifi_country));
ESP_LOGI(TAG, "WiFi manager initialized");
return ESP_OK;
}
esp_err_t wifi_manager_start(void)
{
char ssid[33] = {0};
char password[65] = {0};
// Try to get credentials from NVS
if (wifi_manager_get_credentials(ssid, sizeof(ssid), password, sizeof(password)) == ESP_OK) {
ESP_LOGI(TAG, "Starting WiFi with stored credentials");
ESP_LOGI(TAG, "Attempting to connect to SSID: '%s'", ssid);
ESP_LOGI(TAG, "SSID length: %d", strlen(ssid));
// Set scan mode to prevent auto-connect
s_scan_mode = true;
// Start WiFi for scanning
ESP_ERROR_CHECK(esp_wifi_start());
// Wait a bit for WiFi to initialize
vTaskDelay(100 / portTICK_PERIOD_MS);
// Scan for available networks
ESP_LOGI(TAG, "Starting WiFi scan...");
wifi_scan_config_t scan_config = {
.ssid = NULL,
.bssid = NULL,
.channel = 0,
.show_hidden = true,
.scan_type = WIFI_SCAN_TYPE_ACTIVE,
.scan_time = {
.active = {
.min = 100,
.max = 300,
},
},
};
esp_err_t scan_ret = esp_wifi_scan_start(&scan_config, true);
if (scan_ret != ESP_OK) {
ESP_LOGE(TAG, "WiFi scan failed with error: %s", esp_err_to_name(scan_ret));
} else {
uint16_t ap_count = 0;
esp_wifi_scan_get_ap_num(&ap_count);
ESP_LOGI(TAG, "WiFi scan done! Found %d access points", ap_count);
if (ap_count > 0) {
wifi_ap_record_t *ap_records = malloc(sizeof(wifi_ap_record_t) * ap_count);
if (ap_records) {
esp_wifi_scan_get_ap_records(&ap_count, ap_records);
bool target_found = false;
for (int i = 0; i < ap_count && i < 20; i++) {
ESP_LOGI(TAG, " %d. SSID: '%s', RSSI: %d, Channel: %d, Auth: %d",
i + 1,
ap_records[i].ssid,
ap_records[i].rssi,
ap_records[i].primary,
ap_records[i].authmode);
// Check if our target SSID matches
if (strcmp((char*)ap_records[i].ssid, ssid) == 0) {
ESP_LOGI(TAG, " *** Target SSID found! Channel: %d, Auth: %d ***",
ap_records[i].primary, ap_records[i].authmode);
target_found = true;
}
}
if (!target_found) {
ESP_LOGW(TAG, "Target SSID '%s' not found in scan results!", ssid);
}
free(ap_records);
}
} else {
ESP_LOGW(TAG, "No access points found. Possible issues:");
ESP_LOGW(TAG, " - WiFi antenna not connected");
ESP_LOGW(TAG, " - Wrong country code");
ESP_LOGW(TAG, " - Hardware issue");
ESP_LOGW(TAG, " - All APs on 5GHz only");
}
}
// Clear scan mode
s_scan_mode = false;
// Configure for connection
wifi_config_t wifi_config = {
.sta = {
.threshold.authmode = WIFI_AUTH_OPEN, // Accept any auth
.sae_pwe_h2e = WPA3_SAE_PWE_BOTH,
},
};
strlcpy((char*)wifi_config.sta.ssid, ssid, sizeof(wifi_config.sta.ssid));
strlcpy((char*)wifi_config.sta.password, password, sizeof(wifi_config.sta.password));
ESP_LOGI(TAG, "Setting WiFi configuration...");
ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
// Now trigger connection
ESP_LOGI(TAG, "Connecting to WiFi...");
esp_wifi_connect();
// Wait for connection
EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
pdFALSE,
pdFALSE,
30000 / portTICK_PERIOD_MS); // 30 second timeout
if (bits & WIFI_CONNECTED_BIT) {
ESP_LOGI(TAG, "Connected to AP");
return ESP_OK;
} else if (bits & WIFI_FAIL_BIT) {
ESP_LOGE(TAG, "Failed to connect to AP after retries");
return ESP_FAIL;
} else {
ESP_LOGE(TAG, "WiFi connection timeout");
return ESP_ERR_TIMEOUT;
}
} else {
ESP_LOGE(TAG, "No WiFi credentials found");
return ESP_ERR_NOT_FOUND;
}
}
esp_err_t wifi_manager_stop(void)
{
esp_err_t ret = esp_wifi_stop();
if (ret == ESP_OK) {
s_wifi_state = WIFI_STATE_DISCONNECTED;
s_retry_num = 0;
xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT);
ESP_LOGI(TAG, "WiFi stopped");
}
return ret;
}
bool wifi_manager_is_connected(void)
{
return s_wifi_state == WIFI_STATE_CONNECTED;
}
wifi_state_t wifi_manager_get_state(void)
{
return s_wifi_state;
}
void wifi_manager_register_callback(wifi_event_callback_t callback)
{
s_event_callback = callback;
}
esp_err_t wifi_manager_set_credentials(const char* ssid, const char* password)
{
nvs_handle_t nvs_handle;
esp_err_t ret;
ret = nvs_open(NVS_NAMESPACE, NVS_READWRITE, &nvs_handle);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to open NVS namespace");
return ret;
}
ret = nvs_set_str(nvs_handle, "ssid", ssid);
if (ret != ESP_OK) {
nvs_close(nvs_handle);
return ret;
}
ret = nvs_set_str(nvs_handle, "password", password);
if (ret != ESP_OK) {
nvs_close(nvs_handle);
return ret;
}
ret = nvs_commit(nvs_handle);
nvs_close(nvs_handle);
if (ret == ESP_OK) {
ESP_LOGI(TAG, "WiFi credentials saved");
}
return ret;
}
esp_err_t wifi_manager_get_credentials(char* ssid, size_t ssid_len, char* password, size_t pass_len)
{
nvs_handle_t nvs_handle;
esp_err_t ret;
ret = nvs_open(NVS_NAMESPACE, NVS_READONLY, &nvs_handle);
if (ret != ESP_OK) {
return ret;
}
ret = nvs_get_str(nvs_handle, "ssid", ssid, &ssid_len);
if (ret != ESP_OK) {
nvs_close(nvs_handle);
return ret;
}
ret = nvs_get_str(nvs_handle, "password", password, &pass_len);
nvs_close(nvs_handle);
return ret;
}
esp_err_t wifi_manager_clear_credentials(void)
{
nvs_handle_t nvs_handle;
esp_err_t ret;
ret = nvs_open(NVS_NAMESPACE, NVS_READWRITE, &nvs_handle);
if (ret != ESP_OK) {
return ret;
}
nvs_erase_key(nvs_handle, "ssid");
nvs_erase_key(nvs_handle, "password");
ret = nvs_commit(nvs_handle);
nvs_close(nvs_handle);
if (ret == ESP_OK) {
ESP_LOGI(TAG, "WiFi credentials cleared");
}
return ret;
}